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renderer_app.py

@@ -17,7 +17,8 @@ from renderer.templates import apply_creative_style, apply_preset, list_creative
 
 def _mcp_description(summary: str, example: dict[str, Any]) -> str:
     """Build a concise MCP description with a machine-readable JSON example."""
-    return f"{summary} Example JSON: {json.dumps(example, separators=(',', ':'), ensure_ascii=True)}"
+    payload = json.dumps(example, indent=2, ensure_ascii=True)
+    return f"{summary}\n\nExample JSON:\n```json\n{payload}\n```"
 
 
 def create_dashboard() -> gr.Blocks:

tests/test_mcp_metadata.py

@@ -14,6 +14,11 @@ class MCPMetadataTests(unittest.TestCase):
             for node in tree.body
             if isinstance(node, (ast.FunctionDef, ast.AsyncFunctionDef))
         }
+        formatter_module = ast.Module(body=[functions["_mcp_description"]], type_ignores=[])
+        ast.fix_missing_locations(formatter_module)
+        namespace = {"json": json, "Any": object}
+        exec(compile(formatter_module, "renderer_app.py", "exec"), namespace)
+        format_description = namespace["_mcp_description"]
         events = [
             node
             for node in ast.walk(tree)
@@ -45,8 +50,15 @@ class MCPMetadataTests(unittest.TestCase):
             example = ast.literal_eval(description.args[1])
             self.assertTrue(summary, f"Empty description: {callback_name}")
             self.assertIsInstance(example, dict, f"Example must be an object: {callback_name}")
-            encoded = json.dumps(example, separators=(",", ":"), ensure_ascii=True)
-            self.assertEqual(json.loads(encoded), example)
+
+            rendered = format_description(summary, example)
+            marker = "\n\nExample JSON:\n```json\n"
+            self.assertIn(marker, rendered, f"Missing JSON code block: {callback_name}")
+            self.assertTrue(rendered.endswith("\n```"), f"Unclosed JSON code block: {callback_name}")
+            json_payload = rendered.split(marker, 1)[1][:-4]
+            self.assertEqual(json.loads(json_payload), example)
+            if example:
+                self.assertIn('\n  "', json_payload, f"Example is not indented: {callback_name}")
 
             parameters = [argument.arg for argument in functions[callback_name].args.args]
             self.assertEqual(set(example), set(parameters), f"Example keys do not match: {callback_name}")